I got no response (other than an initial e-mail telling me I filled out part of the form incorrectly, which I answered by e-mail). After hearing nothing, I called them and got a confirmation number. Perhaps it is a NACK rather than an ACK protocol?
Not to worry everyone, but I got an ACK via FAX a few days after I faxed them my reservation.
--Paul Hoffman, Director --Internet Mail Consortium